Legal claims defining the scope of protection, as filed with the USPTO.
1. A digital demodulating apparatus comprising: circuit components constituting a tuner that applies channel select processing to a received signal, and a demodulator that demodulates the signal to which the tuner has applied channel select processing; a power supply unit that supplies power to each circuit component; a reception condition detecting unit that detects a reception condition when the tuner receives the signal; a power adjusting unit that adjusts the power to be supplied to each circuit component by the power supply unit, on the basis of a result of the detection by the reception condition detecting unit; a fading environment estimating unit that estimates a fading environment when the tuner receives the signal; and a power controlling unit that controls the power adjusting unit on the basis of a result of the estimation by the fading environment estimating unit so that the number of times of adjustments of the power by the power adjusting unit per unit time changes in accordance with the variability of the reception condition.
2. The apparatus according to claim 1 , wherein the fading environment estimating unit comprises a frequency deriving unit that derives a Doppler frequency of a Doppler shift that has been generated in the signal received by the tuner.
3. The apparatus according to claim 2 , wherein the power controlling unit controls the power adjusting unit to increase the number of times of adjustments of the power by the power adjusting unit per unit time when the Doppler frequency derived by the frequency deriving unit exceeds a predetermined frequency reference value.
4. The apparatus according to claim 2 , wherein the power controlling unit controls the power adjusting unit to decrease the number of times of adjustments of the power by the power adjusting unit per unit time when the Doppler frequency derived by the frequency deriving unit becomes less than a predetermined frequency reference value.
5. The apparatus according to claim 2 , wherein the apparatus further comprises an evaluation value deriving unit that derives at least one of a modulation error ratio (MER) value and a bit error rate (BER) value when the signal is demodulated, the reception condition detecting unit detects the reception condition on the basis of a result of the derivation by the evaluation value deriving unit over a predetermined time period, and the power controlling unit controls the reception condition detecting unit to shorten the predetermined time period when the Doppler frequency derived by the frequency deriving unit exceeds a predetermined frequency reference value.
6. The apparatus according to claim 2 , wherein the apparatus further comprises an evaluation value deriving unit that derives at least one of a modulation error ratio (MER) value and a bit error rate (BER) value when the signal is demodulated, the reception condition detecting unit detects the reception condition on the basis of a result of the derivation by the evaluation value deriving unit over a predetermined time period, and the power controlling unit controls the reception condition detecting unit to lengthen the predetermined time period when the Doppler frequency derived by the frequency deriving unit becomes less than a predetermined frequency reference value.
7. The apparatus according to claim 2 , wherein the power controlling unit controls the power adjusting unit to increase the number of times of adjustments of the power by the power adjusting unit per unit time when the Doppler frequency derived by the frequency deriving unit exceeds a first frequency reference value, and to decrease the number of times of adjustments of the power by the power adjusting unit per unit time when the Doppler frequency derived by the frequency deriving unit becomes less than a second frequency reference value that is not more than the first frequency reference value.
8. The apparatus according to any of claim 2 , wherein the apparatus further comprises an evaluation value deriving unit that derives at least one of a modulation error ratio (MER) value and a bit error rate (BER) value when the signal is demodulated, the reception condition detecting unit detects the reception condition on the basis of a result of the derivation by the evaluation value deriving unit over a predetermined time period, and the power controlling unit controls the reception condition detecting unit to shorten the predetermined time period when the Doppler frequency derived by the frequency deriving unit exceeds a first frequency reference value, and to lengthen the predetermined time period when the Doppler frequency derived by the frequency deriving unit becomes less than a second frequency reference value that is not more than the first frequency reference value.
9. The apparatus according to any of claim 2 , wherein the power controlling unit allows the power adjusting unit to adjust the power only when the Doppler frequency derived by the frequency deriving unit is within a range in which the power to be supplied to each circuit component can be reduced.
10. The apparatus according to any of claim 1 , wherein the power adjusting unit adjusts the power to be supplied to each circuit component so that the power is reduced as the goodness of the reception condition indicated by the detection result of the reception condition detecting unit is improved.
11. A digital demodulating apparatus comprising: circuit components constituting a tuner that applies channel select processing to a received signal, and a demodulator that demodulates the signal to which the tuner has applied channel select processing; a power supply unit that supplies power to each circuit component; an evaluation value deriving unit that derives as an evaluation value of the reception condition at least one of a modulation error ratio (MER) value and a bit error rate (BER) value when the signal is demodulated; a reception condition detecting unit that compares a result of the derivation by the evaluation value deriving unit with a reference value relating to the evaluation value, and outputs a result of the comparison as a detection result of the reception condition when the tuner receives the signal; a power adjusting unit that adjusts the power to be supplied to each circuit component by the power supply unit, on the basis of the result of the detection by the reception condition detecting unit; a fading environment estimating unit that estimates a fading environment when the tuner receives the signal; and a reference value changing unit that changes the reference value relating to the evaluation value into a value in accordance with the variability of the reception condition, on the basis of a result of the estimation by the fading environment estimating unit.
12. The apparatus according to claim 11 , wherein the fading environment estimating unit comprises a frequency deriving unit that derives a Doppler frequency of a Doppler shift that has been generated in the signal received by the tuner.
13. The apparatus according to claim 12 , wherein the reference value changing unit changes the reference value relating to the evaluation value so that the comparison result of the reception condition detecting unit becomes harder to indicate that the reception condition is good when the Doppler frequency derived by the frequency deriving unit exceeds a predetermined frequency reference value.
14. The apparatus according to claim 12 , wherein the reference value changing unit changes the reference value relating to the evaluation value so that the comparison result of the reception condition detecting unit becomes more apt to indicate that the reception condition is good when the Doppler frequency derived by the frequency deriving unit becomes less than a predetermined frequency reference value.
15. The apparatus according to claim 12 , wherein the reference value changing unit changes the reference value relating to the evaluation value so that the comparison result of the reception condition detecting unit becomes harder to indicate that the reception condition is good when the Doppler frequency derived by the frequency deriving unit exceeds a first frequency reference value; and more apt to indicate that the reception condition is good when the Doppler frequency derived by the frequency deriving unit becomes less than a second frequency reference value that is not more than the first frequency reference value.
16. The apparatus according to claim 15 , wherein the reference value changing unit changes the reference value relating to the evaluation value so that the comparison result of the reception condition detecting unit becomes harder to indicate that the reception condition is good when the Doppler frequency derived by the frequency deriving unit becomes less than a third frequency reference value that is less than the second frequency reference value.
17. The apparatus according to any of claim 11 , wherein the power adjusting unit adjusts the power to be supplied to each circuit component so that the power is reduced as the goodness of the reception condition indicated by the detection result of the reception condition detecting unit is improved.
18. A digital receiver comprising: circuit components constituting a tuner that applies channel select processing to a received signal, and a demodulator that demodulates the signal to which the tuner has applied channel select processing; a power supply unit that supplies power to each circuit component; a reception condition detecting unit that detects a reception condition when the tuner receives the signal; a power adjusting unit that adjusts the power to be supplied to each circuit component by the power supply unit, on the basis of a result of the detection by the reception condition detecting unit; a fading environment estimating unit that estimates a fading environment when the tuner receives the signal; and a power controlling unit that controls the power adjusting unit on the basis of a result of the estimation by the fading environment estimating unit so that the number of times of adjustments of the power by the power adjusting unit per unit time changes in accordance with the variability of the reception condition, the receiver reproducing at least one of character data, image data, computer program data, and sound data on the basis of the demodulated signal from the demodulator.
19. A digital receiver comprising: circuit components constituting a tuner that applies channel select processing to a received signal, and a demodulator that demodulates the signal to which the tuner has applied channel select processing; a power supply unit that supplies power to each circuit component; an evaluation value deriving unit that derives as an evaluation value of the reception condition at least one of a modulation error ratio (MER) value and a bit error rate (BER) value when the signal is demodulated; a reception condition detecting unit that compares a result of the derivation by the evaluation value deriving unit with a reference value relating to the evaluation value, and outputs a result of the comparison as a detection result of the reception condition when the tuner receives the signal; a power adjusting unit that adjusts the power to be supplied to each circuit component by the power supply unit, on the basis of the result of the detection by the reception condition detecting unit; a fading environment estimating unit that estimates a fading environment when the tuner receives the signal; and a reference value changing unit that changes the reference value relating to the evaluation value into a value in accordance with the variability of the reception condition, on the basis of a result of the estimation by the fading environment estimating unit, the receiver reproducing at least one of character data, image data, computer program data, and sound data on the basis of the demodulated signal from the demodulator.
20. A controlling method of a digital demodulating apparatus comprising circuit components constituting a tuner that applies channel select processing to a received signal, and a demodulator that demodulates the signal to which the tuner has applied channel select processing; and a power supply unit that supplies power to each circuit component, the method comprising: a reception condition detecting step of detecting a reception condition when the tuner receives the signal; a power adjusting step of adjusting the power to be supplied to each circuit component by the power supply unit, on the basis of a result of the detection in the reception condition detecting step; a fading environment estimating step of estimating a fading environment when the tuner receives the signal; and a controlling step of controlling the power adjustment in the power adjusting step on the basis of a result of the estimation in the fading environment estimating step so that the number of times of adjustments of the power per unit time changes in accordance with the variability of the reception condition.
21. A controlling method of a digital demodulating apparatus comprising circuit components constituting a tuner that applies channel select processing to a received signal, and a demodulator that demodulates the signal to which the tuner has applied channel select processing; and a power supply unit that supplies power to each circuit component, the method comprising: an evaluation value deriving step of deriving as an evaluation value at least one of a modulation error ratio (MER) value and a bit error rate (BER) value when the signal is demodulated; a comparing step of comparing a result of the derivation in the evaluation value deriving step with a reference value relating to the evaluation value; a reception condition detecting step of detecting the reception condition when the tuner receives the signal, on the basis of a result of the comparison in the comparing step; a power adjusting step of adjusting the power to be supplied to each circuit component by the power supply unit, on the basis of a result of the detection in the reception condition detecting step; a fading environment estimating step of estimating a fading environment when the tuner receives the signal; and a reference value changing step of changing the reference value relating to the evaluation value into a value in accordance with the variability of the reception condition, on the basis of a result of the estimation in the fading environment estimating step.
22. A non-transitory computer-readable recording medium recording thereon a computer program product for a digital demodulating apparatus comprising circuit components constituting a tuner that applies channel select processing to a received signal, and a demodulator that demodulates the signal to which the tuner has applied channel select processing; and a power supply unit that supplies power to each circuit component, the product causing the apparatus to execute: a reception condition detecting step of detecting a reception condition when the tuner receives the signal; a power adjusting step of adjusting the power to be supplied to each circuit component by the power supply unit, on the basis of a result of the detection in the reception condition detecting step; a fading environment estimating step of estimating a fading environment when the tuner receives the signal; and a controlling step of controlling the power adjustment in the power adjusting step on the basis of a result of the estimation in the fading environment estimating step so that the number of times of adjustments of the power per unit time changes in accordance with the variability of the reception condition.
23. A non-transitory computer-readable recording medium recording thereon a computer program product for a digital demodulating apparatus comprising circuit components constituting a tuner that applies channel select processing to a received signal, and a demodulator that demodulates the signal to which the tuner has applied channel select processing; and a power supply unit that supplies power to each circuit component, the product causing the apparatus to execute: an evaluation value deriving step of deriving as an evaluation value at least one of a modulation error ratio (MER) value and a bit error rate (BER) value when the signal is demodulated; a comparing step of comparing a result of the derivation in the evaluation value deriving step with a reference value relating to the evaluation value; a reception condition detecting step of detecting the reception condition when the tuner receives the signal, on the basis of a result of the comparison in the comparing step; a power adjusting step of adjusting the power to be supplied to each circuit component by the power supply unit, on the basis of a result of the detection in the reception condition detecting step; a fading environment estimating step of estimating a fading environment when the tuner receives the signal; and a reference value changing step of changing the reference value relating to the evaluation value into a value in accordance with the variability of the reception condition, on the basis of a result of the estimation in the fading environment estimating step.
Unknown
November 27, 2012
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